Electric glow-lamp.



H. REMANB, E. HURWITZ 6; E. GOTTSGHALK.

' vELElZfIEIC GLOW LAMP.

APPLICATION FILED JULY 18. 1907.

Patented Apr. 27, 1909.

Ulf/5555 A *TED sTATEs HERMANN REMAN AND EUGEN HUawIrz, OF'BERLIN, AND EniLco'rTscHALmoF CHAR- LOTTENBURG, GERMANY, AssIGNoRs To DEUTSCHE GASGLUHLIOHT AKTIEN GESELL- scHAFT AUERGESELLSGHAFT, or BERLIN,GERMANY, AooRPoRATIoN.

ELECTRIC GLOW-LAMP. Y

To all whom fit 'may concern: Y y

Be it known that we, HERMANN REMAN, chief engineer, a subject ofthe German Emperor, and a. resident of Berlin, Plan Ufer No. 14; EUGEN Htmwrrz, en ineer, a subject of I the German Emperor, an a-resident of Ber- 1in, Klopstockstrasse 31, and EMIL GOTT- soHALK, engineer, a subject of the German Emperor, and a resident of Charlottenburg, Spandauerstrasse 17, Germany, have invented certain vnew and useful Improvements-in ElectrieGloW-Lamps; and we do hereby declare the following to be a full,l

clear, land exact description of the invention,l such as will enable others skilled in theA art torwhich it appertains to make and use the same, reference bein had tothe accompanyingI drawings, an to letters of reference mar ed thereon, which form a part of this specification.

carried out successfully when platinum wires are u sed as the supports or current leads but if nickel Wires be used, frequent breakages will occur. This is caused by the formation of an alloy of a small portion of the nickel with the tungsten when the nickel ends are fused (by means of the electric arc). 'This alloy is itself readily fusible and causes a reduction in the sectional area of the filaments in the vicinity of the fused portion owing to the fusible alloy running down and this causes the filaments to break readily at these weakened places. If cop er be used for the supporting Wire instead o nickel, another defeet -is caused by the filament breaking Specification-of Lettera Patent;` DPUQSOB lefl 1s, 1907. sQl-ill N0. 384,857.

.retenu-Sd .Aprn 27, 190e .through andvrescap" the surrounding v fused globule beforgllgt has solidified. The resent invention relates to-a means lfor obviating thesefinconveniences by `using, as a filament su port, a wire .containing two metals; one of t em being for instance vcoper itself or a metal (such as silver) which b eaves like cop er, and' -a second metal, for instancenicke or a metal (such as iron) of valnalo ous behavior. It is "importanty-that one o lthe metalsshould readily form `alls with tungsten, while` the other ymeta/l shod not. l Y

o A convenientmeansconsists in using wires 'composed of alloys ofthe 1aforesaid metals,

though it-is alsosuicient 'for the two metals` to be4 merely -mechanica1lgL`u`Iiited,"in-the Wires. Forl 'exam le,A a wire can be -used composed of nicke with a coating of copper,

or Va cop er wire coated with nickel.

the filament supports need not alwa s be terminals or vcurrent leads in the or nar sense of the term, for instance when the en s of two filaments are incorporated in a single fusion lobule.

In t e drawings which are merely diatrates the Weakenin of the -tun sten lament a in a support made of nic el. 2 shows how the filament c becomes detached from the end of the copper wire d, and Fig. 3 shows the arrangement of two filament ends e f in a common fusion globule g. Fig. 4 shows arcomplete electricglow lamp in accordance with the invention.

Having now particularly described and ascertained thenature of our said invention andin what manner the same is'to be performed, We declare that what we claim isil. An electric -glow lamp comprisin a tungsten filament attached to the mezed ends of supportsY containin two metals one of which has the property o forming an alloy Itlshould a o be 'expressly understood that vto make the processes clear z-Figure 1 illusv Y with tungsten while the otheil 4has vthe conl In testimony, that we claim the foregoing` traryroperty. A Y as our invention,rwehave..s1gned our names 2. electricglow lamp comprising a in presence of` two subscnlnngwltnesses.

v tungsten filament attached to the ends of l l 5 sup orts containing a metal of the iron group t l y E' an y a metal of the copper group. v i v B. An electric glow lamp comprising .s v 'EMIL tungsten filament attached to the-ends of L 'Witnessem supports containing an alloyof copper'and HENRY HAsPER, 10 nickel. l W'oLDnMA HAUPL DIsoLAImmB- i 919',381.'Hmnann Remane and Eugen Hurwitz, Berlin, and Emil Gottschalk, Char-v lottenburg, Germany. ELECTRIC GLOW-LAMP. j Patent dated April27, 1909. Disclaimer led April 19, 1911,r by theassignee by mesas-assignments, the General Electric Oompany. A

Enters this disclafn'ner--r -v Y K f A I Y l Tothat part of. the description of said patent which is foundinlines 50-51 and lines 59` to 65 thereof, as far as the same may be construedto relate to a wire or wires containing one metal in solid form' and carrying a pasteor an emulsion havingas its active ingredient a different metal or in fact as' far as'the same relatesV to-a. structure other than that in which the support shall comprise' the two-metals in a solid metallic structure.

Further enters this disclaimer-,-A Y Y To claims 1, and 2 in so far as the 'same may'be construed to relate to a wire or wires containing one metal in solid form sind carrying a paste or an emulsion having as its active ingredient a'divierent metal" or in fact as far as the same relates to a structure other than that in which the support shall comprise the two metals in a solid metallic structure.-[ Ojcz'al Gazette, April 95, 1.911.]

Y with tungsten while the other 4has vthe conl In testimony, that we claim the foregoing` traryroperty. A Y as our invention,rwehave..s1gned our names 2. electricglow lamp comprising a in presence of` two subscnlnngwltnesses.

y tungsten filament attached to the ends of l e 5 sup orts containing a metal of the iron group t l y E' an y a metal of the copper group. v i v B. An electric glow lamp comprising .a v 'EMIL tungsten filament attached to the-ends of L 'Witnessem supports containing an alloyof copper'and HENRY HASPER, 10 nickel. l W'oLDnMA HAUPL DIsoLAImmB- s 919',381.'Hmnann Remane and Eugen Hurwitz, Berlin, and Emil Gottschalk, Char-v lottenburg, Germany. ELECTRIC GLOW-LAMP. j Patent dated April27, 1909. Disclaimer filed April 19, 1911,r by theassignee by means-assignments, the General Electric Oomptmy. A

Enters this disclairl'xer;r -v Y i f A I i' l Tothat part of. the description of said patent which is foundi'nlines 50-51 and lines 59` to 65 thereof, as far as the same may be construedto relate to a wire or wires containing one metal in solid form' and carrying a pasteor an emulsion havingas its active ingredient a different metal or in fact as' far as'the same relatesV to-a. structure other than that in which the support: shall comprise' the two-metals in a solid metallic structure.

Further enters this disclaimer-,-A Y Y To claims 1, and 2 in so far as the 'same may'be construed to relate to a wire or wires containing one metal in solid form sind carrying a paste or an emulsion having as its active ingredient aidiierent metal" or in fact as far as the same relates to a structure other than that in which the support shall comprise the two metals in a solid metallic structure.-[ Ojcz'al Gazette, April 95, 1.911.]

Disclaimer in Letters Patent Ne. 919,381.

DISCLAIMER- 919,381.Her112ann Remane and Eugen Humtz, Berlin, and Emil Gottschalk, Charlottenburg, Germany. ELECTRIC GLOW-LAMP. Patent dated April 27, 1909. Disclaimer filed April 19, 1911, by the assignee by mesne assignments, the General lilec'rz'c Company. Enters this disclaimer* To that part of, the description of said patent which is found in lines 50-51 and lines 59 to 65 thereof,

Further enters this disclaimer- To claims 1 and 2 in so far as the same may be construed to relate to a wire or 

